Process of making negative electrodes for electric accumulators



' UNITED. STATES- PATENT OFFIC .ADQLFO POUGEAIN, OF TUBIN', ITALY.

rnocnss orxanme'marrvn snsc'rnonus iron unncrnrc ACCUMULATORS.

' a Specification of Letters rate'nt. 'PatentedJ 25 1921.

17o Drawing. Original application filed September 18, 1919, Serial No. 824,858. Divided and this application fled lfebruary 13, 1920: Serial K0 358351 To allwlwm'it may concem:

Be it known that I, AnoLroPoUcHAm, a. subject of the King of Italy, and resident of Turin, Italy, have invented certain" new and useful Processes of Making Negative Electrodes for Electric Accumulators, of which the following is a specification.

This invention relates to zinc negative electrodes for electric accumulators and has for its object a method for making said electrodes by coating a core or supporting plate of conducting material with a layer of zinc, the present case being a division of my prior a plication filed September 18, 1919, Serial 0. 324,658. I The process according to this invention consists in placing said core or supporting plate into a bath of salts of zinc,-preferably with addition of salts of mercury and magnesium and causing an electric current to flow through said bath, the core or supporting plate to be coated with zinc acting as a cathode.

- The preferred manner of putting into practice this process is hereinafter described: the core or supporting plate, which as above stated is made of conducting material, is placed in a bath containing zinc sulfate, mercuric sulfate and magnesium sulfate, and an electric current is passed "through said'bath,'the core or supportin I the plate to be coated with zinc being inse as a cathode in said bath.

By this treatment a very thin layer or eslum is obtained on of mercury with plate, and then there is depositedfthe zinc in a granular state.

When .th "c deposit is about a negligive electrodein electric accumulators. tead of subjecting the supporting plate or core directly to the treatment in the afore- I said bath, it may be firstcovered with a very layer of copper, such as by electro-deposition.

cury and magnesium"an 1 current through bath whi e util zing The composition of the, bath which has been found to give satisfactory results is as follows: five parts of zinc sulfate, one part o f mercuric sulfate and one part of magnesium sulfate; however it is to be understood that this invention is not confined to the above-stated composition of the bath,

to be moditerial is a good conductor of electric current.

What I claim as my invent'on and desire to secure by United States tters Patent 1s 1. .A method of makin negative electrodes for electric accumu ators, consisting in placing a core of'conducting material in a bath containing salts of zinc, mercury and magnesium; and passing an electric current through the bath while utilizing said core as the cathode. i

2. A method of making negative electrodes for electric accumulators, consistin in placing acore of retort carbon in a bat containing salts of zinc, mercury andmag passing anelectric current nesium; and

through-said bath' while utilizing said core as the cathode.

.3. A method for making negative electrodes for electric accumulators, consisting in coating a core of retort carbon with a very thin layer of'copper; placin the coated core in a bath contaming salts 0 nine, mer- Si core as the'cathode. v

at Turin Ital this 21 J an., 1920. Al )0L o 'POUCHAIN.

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